linux-kernel - [PATCH tip/core/rcu 11/15] rcu/tracing: Set disable_rcu_irq_enter on rcu_eqs

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Date:   Mon, 24 Jul 2017 14:44:40 -0700
From:   "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:     linux-kernel@...r.kernel.org
Cc:     mingo@...nel.org, jiangshanlai@...il.com, dipankar@...ibm.com,
        akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
        josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org,
        rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
        fweisbec@...il.com, oleg@...hat.com,
        Masami Hiramatsu <mhiramat@...nel.org>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [PATCH tip/core/rcu 11/15] rcu/tracing: Set disable_rcu_irq_enter on rcu_eqs_exit()

From: Masami Hiramatsu <mhiramat@...nel.org>

Set disable_rcu_irq_enter on not only rcu_eqs_enter_common() but also
rcu_eqs_exit(), since rcu_eqs_exit() suffers from the same issue as was
fixed for rcu_eqs_enter_common() by commit 03ecd3f48e57 ("rcu/tracing:
Add rcu_disabled to denote when rcu_irq_enter() will not work").

Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
Acked-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
---
 kernel/rcu/tree.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 7e018696fd82..913c90eccd4d 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -955,8 +955,10 @@ static void rcu_eqs_exit(bool user)
 	if (oldval & DYNTICK_TASK_NEST_MASK) {
 		rdtp->dynticks_nesting += DYNTICK_TASK_NEST_VALUE;
 	} else {
+		__this_cpu_inc(disable_rcu_irq_enter);
 		rdtp->dynticks_nesting = DYNTICK_TASK_EXIT_IDLE;
 		rcu_eqs_exit_common(oldval, user);
+		__this_cpu_dec(disable_rcu_irq_enter);
 	}
 }
 
-- 
2.5.2